#2C3F81
Closest named color: Twilight Blue (#0A437A). oklch(39% 0.113 268.6), rgb(44, 63, 129).
Aa
White text reads best on this color (9.83:1).
About this color
#2C3F81 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.113 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.032 away. White text reads best on it, at 9.83:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.13:1 |
| White text | 9.83:1 |
Values
| HEX | #2C3F81 |
| RGB | rgb(44, 63, 129) |
| HSL | hsl(227, 49%, 34%) |
| OKLCH | oklch(39% 0.113 268.6) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #2C3F81 | 9.83:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #2C3F81 | 2.13:1 | Fails | Lc 11.4 | Not readable |
| #2C3F81 text on white | 9.83:1 | AAA | Lc 92.5 | Preferred for body text |
| #2C3F81 text on black | 2.13:1 | Fails | Lc -9.9 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#AABFF9
oklch(80.9% 0.086 269)
-
Step 400
400
#7D9CF5
oklch(70.7% 0.135 268.3)
-
Step 500
500
#5E80F2
oklch(63.2% 0.175 268.5)
-
Step 600
600
#4766E0
oklch(55.6% 0.189 268.7)
-
Step 700
700
#3954C3
oklch(49.2% 0.176 268.7)
-
Step 800
800
#2F459D
oklch(42.6% 0.145 268.8)
-
Step 900
900 (this color)
#2C3F81
oklch(39% 0.113 268.6)
-
Step 950
950
#182349
oklch(26.9% 0.072 269)
#2C3F81 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #1B4783 | 0.025 |
| Deuteranopia (no green cones) | #074080 | 0.030 |
| Tritanopia (no blue cones) | #004E5A | 0.095 |
| Achromatopsia (no color) | #434343 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2C3F81
#2C3F81
oklch(39% 0.113 268.6)
- #564200
#564200
oklch(39% 0.08 89.1)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #2C3F81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.032
- Cobalt #1E488F ΔE 0.033
- Dark Slate Blue #483D8B ΔE 0.045
- Light Navy #155084 ΔE 0.049
- Blueberry #464196 ΔE 0.052
- Dusk Blue #26538D ΔE 0.057
- Marine Blue #01386A ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.063
Use #2C3F81 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.